What tools might you use to observe birds

What type of lipids are found in all biological membranes?

Why is it important that fibrin is insoluble in water?

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand